Finding the perfect theme and good apps!!

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So basically I have the free venture theme for my site and it is a one product site. Which themes do you guys recommend for one product store whether is be free or paid. I am willing to spend up to 100$ on a theme. Just need a good on product theme which will help with sales. Also what are some apps that will convernt sales. I target mobile users and advertise for them and I dont want pop ups ad they are really annoying. What are some good apps. Thanks in advance!